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Subject[PATCH v2] ata: Disable AHCI ALPM feature for Ampere Computing eMAG SATA
Date
Due to hardware errata, Ampere Computing eMAG SATA can't support
AHCI ALPM feature. This patch disables the AHCI ALPM feature for
eMAG SATA.

Changes for v2:

* Introduce the new ata_port_info object which includes ATA_FLAG_NO_LPM.
* Include this object for eMAG SATA inside the acpi match table.
* Retrieve the ata_port_info from the acpi match table.

Signed-off-by: Suman Trpathi <stripathi@amperecomputing.com>
Signed-off-by: Rameshwar Prasad Sahu <rameshwar.sahu@amperecomputing.com>
---
drivers/ata/ahci_platform.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 99f9a89..c3043f6 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -33,6 +33,13 @@
.port_ops = &ahci_platform_ops,
};

+static const struct ata_port_info ahci_port_info_nolpm = {
+ .flags = AHCI_FLAG_COMMON | ATA_FLAG_NO_LPM,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_platform_ops,
+};
+
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
@@ -41,7 +48,8 @@ static int ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
- int rc;
+ const struct ata_port_info *port;
+ int rc;

hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
@@ -57,7 +65,11 @@ static int ahci_probe(struct platform_device *pdev)
if (of_device_is_compatible(dev->of_node, "hisilicon,hisi-ahci"))
hpriv->flags |= AHCI_HFLAG_NO_FBS | AHCI_HFLAG_NO_NCQ;

- rc = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
+ port = acpi_device_get_match_data(dev);
+ if (!port)
+ port = &ahci_port_info;
+
+ rc = ahci_platform_init_host(pdev, hpriv, port,
&ahci_platform_sht);
if (rc)
goto disable_resources;
@@ -85,6 +97,7 @@ static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
MODULE_DEVICE_TABLE(of, ahci_of_match);

static const struct acpi_device_id ahci_acpi_match[] = {
+ { "APMC0D33", (unsigned long)&ahci_port_info_nolpm },
{ ACPI_DEVICE_CLASS(PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff) },
{},
};
--
1.8.3.1
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